A780 warning in ABB DCS880 drive indicates Motor stall. This means the motor is operating in the stall region because of excessive load or insufficient motor power.

1. Check the motor load/mechanics (e.g. brake).
2. Check the drive ratings for correct field current.
3. Check the settings of 31.24 Stall function, 31.25 Stall torque level, 31.26 Stall speed level and 31.28 Stall time.
4. Check the settings for current and torque limits in group 30 Control limits.